This is a 13w Biax D/E compact fluorescent from GE in a 3000k Warm White colour and G24q-1 cap type. The double turn compact fluorescent lamps are a replacement for incandescent lamps offering a higher efficiency and great energy savings. These types of compact fluorescent is perfect for shallow downlights and are often used in public buildings, offices, shops, supermarkets, hotels, restaurants and around the home. The 4 Pin versions are designed primarily for use with high frequency ballasts or in emergency lighting applications. The 13w Biax D/E boasts a 900 lumen output and a 13000 hours average lifetime. General Characteristics Wattage 13w Pins 4 pins Shape Quad Tube – 2 loops Lamp Base G24q-1 Colour 3000k – Warm White Equiv Wattage 75w Incandescent Lifespan 13000 hours Lumens 900 lumens Length 130mm Diameter 27mm This is the closest colour available to 835 standard white. Ge made the 835 option obsolete.